use webpa-interface-used from the command line to populate metadata

[piccione99]

Originally we wanted the websocket to loop through all possible interfaces in some sort of priority order and then populate whichever one it uses. But paradus doesn't do this. And we don't know enough how to do this and it seems like we would be re-inventing the wheel if RDK / tr181 is already handling this for us. For now, just copy whatever we are told into the metadata header.

• removed InterfaceUsedProvider as it's no longer needed

note - all my changes are 100 percent unit test covered. codecoverage is complaining about coverage in files I removed code from (?)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.66%. Comparing base (7f18261) to head (bacf645).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #216      +/-   ##
==========================================
+ Coverage   74.98%   77.66%   +2.67%     
==========================================
  Files          75       74       -1     
  Lines        4642     4625      -17     
==========================================
+ Hits         3481     3592     +111     
+ Misses        955      836     -119     
+ Partials      206      197       -9     

Flag	Coverage Δ
unittests	77.66% <100.00%> (+2.67%)	⬆️

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